diff --git a/rpcs3/Emu/RSX/rsx_methods.cpp b/rpcs3/Emu/RSX/rsx_methods.cpp
index 2a563af583..11c8fc89a0 100644
--- a/rpcs3/Emu/RSX/rsx_methods.cpp
+++ b/rpcs3/Emu/RSX/rsx_methods.cpp
@@ -78,7 +78,9 @@ namespace rsx
 		void semaphore_release(thread* rsx, u32 _reg, u32 arg)
 		{
 			const u32 addr = get_address(method_registers.semaphore_offset_406e(), method_registers.semaphore_context_dma_406e());
+			vm::reader_lock lock;
 			vm::ps3::write32(addr, arg);
+			vm::notify(addr, 4);
 		}
 	}